/Engine/Source/Runtime/CoreUObject/Public/UObject/FieldPath.h
MapKeyFuncs forTFieldPathwhich allow the key to become stale without invalidating the map.
template<typename [KeyType](API\Runtime\Core\Containers\BaseKeyFuncs\KeyType), typename ValueType, bool bInAllowDuplicateKeys> struct TPropertyPathMapKeyFuncs : public [TDefaultMapKeyFuncs< KeyType, ValueType, bInAllowDuplicateKeys >](API\Runtime\Core\Containers\TDefaultMapKeyFuncs)